Sr. Embedded Developer

TechDigital Group; Colorado; On-site; USD 120,000 - 180,000; Full time

Job summary

TechDigital Group is seeking a senior embedded WiFi engineer to design, implement, and maintain WiFi radio configuration across multiple chipsets and bands. You will work on OpenSync/OpenWrt/RDK-B based cloud-managed radio configuration, debugging, and performance optimization in a Linux-based gateway environment.

You will collaborate with hardware, QA, cloud, and mobile teams to ensure robust, standards-compliant WiFi integration, kernel-level debugging, and device interoperability across

Qualifications

• 10+ years embedded C programming in Linux environments.
• 10+ years WiFi standards & networking domain expertise; basic 5G/LTE knowledge.
• Strong debugging and problem solving skills with 10+ years.
• Experience with networking devices (wifi routers, CMTS); hands-on with OpenSync/OpenWrt/RDK-B is a plus.

Responsibilities

• Develop and maintain WiFi radio configuration across chipsets for 2.4GHz, 5GHz, and 6GHz bands.
• Implement and debug WiFi features including band steering, client steering, channel selection, BSS Coloring, OFDMA, MU-MIMO, TWT, and MLO (WiFi 7).
• Work with hostapd/wpa_supplicant configuration, CFG80211/mac80211/nl80211 driver interfaces.
• Develop and maintain OpenSync WiFi managers for cloud-managed radio configuration, client monitoring, and statistics reporting.
• Debug WiFi driver crashes, firmware asserts, performance regressions, and interoperability issues across client devices.
• Implement mesh/extender backhaul configuration and optimization.
• Develop and tune RvR (Rate vs Range) and throughput KPIs across firmware builds.
• Support channel switching, ECSA, radar detection (Client), and regulatory compliance across multiple country codes.
• Platform & Common: Design, develop, and debug embedded C software for Linux-based residential gateway platforms (ARM/MIPS SoC).
• Develop and maintain OpenSync managers - event-driven daemons that interact with OVSDB for cloud-managed configuration and state reporting.
• Implement secure communication channels using TLS with mutual authentication (mTLS) between router and cloud/mobile app.
• Debug kernel-level issues including network driver crashes, kernel panics, and memory leaks.
• Develop init scripts, UCI configuration handlers, and persistent storage management for OpenWrt.
• Analyze and resolve field issues using device logs, crash dumps, logpull analysis, and remote diagnostics.
• Write unit tests and participate in code reviews via GitLab merge requests.
• Collaborate with hardware teams, QA, cloud platform engineers, mobile app teams, and service provider partners.

Skills

Embedded C

Linux

Networking

Debugging

OpenSync

OpenWRT

RDK-B

Tools

OpenSync

OpenWRT

RDK-B

hostapd/wpa_supplicant

CFG80211/mac80211/nl80211

Job description

• 1. Embedded C Programming, Linux, Operating System (10+ years)
• 2. WiFi standards and Networking Domain Expertise (10+ years), basic understanding of 5G/LTE technology (high level)
• 3. Strong debugging and problem solving skills (10+ years)
• Prior experience working with networking devices such as wifi routers, cable modems, CMTS etc. will be beneficial. Hands on experience working with Opensync, OpenWRT, RDK-B etc. will be an advantage.

WiFi Integration

• Develop and maintain WiFi radio configuration across Qualcomm, Broadcom, and Atheros chipsets for 2.4GHz, 5GHz, and 6GHz bands
• Implement and debug WiFi features including band steering, client steering, channel selection (Client/non-Client), BSS Coloring, OFDMA, MU-MIMO, TWT, and MLO (WiFi 7)
• Work with hostapd/wpa_supplicant configuration, CFG80211/mac80211/nl80211 driver interfaces
• Develop and maintain OpenSync WiFi managers for cloud-managed radio configuration, client monitoring, and statistics reporting
• Debug WiFi driver crashes, firmware asserts, performance regressions, and interoperability issues across client devices
• Implement mesh/extender backhaul configuration and optimization
• Develop and tune RvR (Rate vs Range) and throughput KPIs across firmware builds
• Support channel switching, ECSA, radar detection (Client), and regulatory compliance across multiple country codes

Cellular Backup (Phone-as-Backhaul)

• Implement phone-as-backhaul connectivity - enabling the router to use the customer's mobile device as a backup WAN path
• Develop the router-side failover client that communicates with the companion mobile app (MSA) to initiate and terminate backup sessions
• Implement WAN outage detection and internet reachability healthcheck framework
• Develop route arbitration and traffic steering logic between primary WAN and phone-based cellular backup
• Manage concurrent WiFi AP + STA operation - serving home clients on AP while connected to phone hotspot as upstream STA
• Handle USB tethering detection and network interface management (RNDIS/CDC-NCM/CDC-ECM)
• Implement graceful failback logic when primary WAN recovers
• Develop LED state machine logic for multi-WAN connectivity status indication
• Implement QoS and bandwidth management during cellular backup mode (customer's data plan awareness)

Platform & Common

• Design, develop, and debug embedded C software for Linux-based residential gateway platforms (ARM/MIPS SoC)
• Develop and maintain OpenSync managers - event-driven daemons that interact with OVSDB for cloud-managed configuration and state reporting
• Implement secure communication channels using TLS with mutual authentication (mTLS) between router and cloud/mobile app
• Debug kernel-level issues including network driver crashes, kernel panics, and memory leaks
• Develop init scripts, UCI configuration handlers, and persistent storage management for OpenWrt
• Analyze and resolve field issues using device logs, crash dumps, logpull analysis, and remote diagnostics
• Write unit tests and participate in code reviews via GitLab merge requests
• Collaborate with hardware teams, QA, cloud platform engineers, mobile app teams, and service provider partners